Affiliation:
1. Department of Physiology, University of Virginia School of Medicine Charlottesville, Virginia 22901
Abstract
The force-velocity and series elastic characteristics of vascular strips from the media of hog carotid arteries were determined using the method of quick release to a known afterload. Shortening velocity was a function of load, and the data could be fitted by a rectangular hyperbola using the Hill equation, (P + a) V = b (P
o
- P), where P is the load, P
o
is the maximum isometric force developed at the optimum muscle length (L
o
), V is velocity, and a and b are constants. The following dynamic constants were obtained for the electrically stimulated strips: estimated maximum shortening velocity for the unloaded muscle (V
max
) = 0.12 L
o
/sec, b = 0.02 L
o
/sec, P
o
= 1.80 kg-wt/cm
2
= 1.76 x 10
6
dynes/cm
2
, and a/P
o
= 0.18. Maximum power output occurred at a load of 0.28 P
o
. The stress-strain curve for the series elastic component could be approximated by the simple exponential equation, stress = 0.034e
058 strain
. The extension of the series elastic component at P
o
was 7.2% of L
o
.
Publisher
Ovid Technologies (Wolters Kluwer Health)
Subject
Cardiology and Cardiovascular Medicine,Physiology
Cited by
77 articles.
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